An infinitely long solid nonconducting cylinder of radius 2.40m with a uniform charge density p = +1.00 x 10-6 C/m3 has a coaxial infinitely long cylindrical hole of radius 0.80 m.
a. What is the magnitude of the electric field E at a distance r = 0.40 m from the axis of symmetry?
b. What is E at r = 1.60 m?
c. What is E at r = 4.80 m?